1. Center of Super-Diamond and Advanced Films (COSDAF); Department of Physics and Materials Science; City University of Hong Kong; Tat Chee Avenue 83, Kowloon Hong Kong 999077 China
2. Department of Mechanical and Biomedical Engineering; City University of Hong Kong; Tat Chee Avenue 83, Kowloon Hong Kong 999077 China
3. Centre for Advanced Structural Materials; City University of Hong Kong Shenzhen Research Institute; 8 Yuexing 1st Road, Shenzhen Hi-Tech Industrial Park Nanshan District Shenzhen China